FROM THE New York Times science blog Dot Earth comes this Yonkers Historical Society 1920s photograph of a giant flume being run where the Saw Mill River used to flow. Now, according to a story by Andrew C. Revkin, Yonkers is trying to unbury the river to create a greenway.

For Revkin’s blog on movements around the world, including in Los Angeles, to “daylight” buried or paved rivers, click here.

For information about moves to restore the Los Angeles River, click here.